The term "being out of line" can be defined as behaving or acting in an inappropriate or unacceptable way. To express the opposite meaning of this term, we can use antonyms like "being in line," "being proper," "being appropriate," or "being respectful." These terms imply that an individual is following the norms, regulations, and ethics that are considered acceptable in society. Being in line means that one is following the right path, while being proper indicates that one is acting in a fitting manner. Similarly, being appropriate denotes that one is adhering to the circumstances, and being respectful implies that one is showing deference and regard for others.